Watch-glass grinder.



E; ,R. MATTERS.

WATCH GLASS GRINDER.

APPLIGATION rum) MAR. 24V 1am RBNEWBD APR.29,1911.

1,010,506.. Patented Dec. 5, 1911.

nto r,

Attorneys opening ably inte against t eend of the .shaft 5 from movingltoward t e shaft.

vomi.

rATEN'r OFFICE.

#DNALBIJ RICHARD MATTERS, F HEOSH, MISSOURI, ASSIGNO Y0F ONE-HALF T0 JAYA. SEAGROVES, OF NEOSHQ MISSOURI. u

Wa'rorLoLass Gemona.

Specification of Letters Patent.

4indented Dec. 5, 1911.

Application tiled March 24, 1910, Serial No. 551,310. Renewed April 2B,1911. erlal No. 824,146.

. The device lforming the suh`ect matter of this application is adaptedto e mounted in a' jewelers lathe, to .be-employed forgrindingwatch'glasses and the like. r

t is ythe object ofihis .invention to pro vide rotatably monntedgrindingelements' o novel vandimproved form; to provide a novel means formounting the grinding elementsfor rotation; to provide a novel means foradvancing oneof said grindingheads toward the other; and forvmaintaining the adjustable grinding head in the position to which ithas been advanced.

'In the drawings, Figure 1 is a side eleva' tion; Fig. :2 is an endelevation; Fi 3 is 4a longitudinal section; Fig'. 4 is a detal ed persestive of the cani shaft; Figs. and 6 are e evations of the grindingheads; and, Fig. fi'` is a section of the cam shaft 'on the line .Af-Bof Fig. 4. i o The device4 includes, asa primaryand fundamental.element, va .'U sha )ed support-- ing member 1, the arms 2'. of whichterminate in heads 3 and 4, these heads .having openin which arer'noun'ted for rotation, re-

fsectivly', a shaft 5 and ashaft .6.' The s aft 5 lis provided with aooll-ar 7 preferally formed and adapted to bear. liead 3 to revent'thegrinding head 8 is provided, `the saine having an outstanding shoulder9, provided with a stud 10, adapted. to he threaded into an 14 in theAend of the shaft 5. 'The' collar ispositionedupon 'the shaftV 5 in sucha Way that when the shoulderf) of the head 8 is rotated against the end:of the shaft 5, the shoulder 9 will not'be bound-against- .the ,end ofthe head 3. AA. grindng head 11 is provided, having an opening 955,111whieh ray' be secured by threading or, otherwise, tn e'reduoed end 2 6of the s hait. 6. This. shaft-6 vis slidably mounted v1x1-thez headandthe elements- 8 a'ndf 11 haveiupon their' .idjfacentsurfaeegfacings12pre i `'oiled from cork.,

,muy nel.

jsndsbiy moaned inflate ein .ag

1.3, provided at its outer end with a milled thumb piece 1 6. Inth'einner end of the pin 15 there is aconcnved socket 1T, in which therounded end 18 of the shaft/6 is adapted to rotate, The-pin- 15 has alongitudinally extended slot 19, terminating within the contour of thepin. A

Mounted 'transversely in the head 4 below the pinV l'is a shaft 20. Thisshaft 20 has a rounded transverse groove.l 21, adapted to 'thus theshoulder 2.4 upon the shaft 2() is engaged, lpreventin 4the shaft 20from being accidental ly with' rawn, since, either the shoulder 24 0rthe groove 21 of the shaft 20 are at all times in engagement with thepin 15. V

The shaft 20 has atY one end,.a radially disposedhandle'23.4 Itwill beseen` that this handle 23 is so positioned with respect to the groove 21.that if the groove 211s to be so positioned with res ect tothe openingin the head i in which tlie pin 154 is mounted, that the pin 15 may bewithdrawn, the han- .dle 23 must upstand above the horizontal,

in the position indicated in, dotted line in Fig. 1; whereupon 4the pin15 may be withdrawn. As soon as the handle 23 is rotated vsin thedirection Vof the arrow A, the shoulder 24 is first positioned to engagethe pin 15, thus preventing the withdrawal of the shaft 20; andsubsequently the cam face 22 ofthe Shift so is made mentes the gloria,thusg prevention the 'withdrawal ofthe pin 15.

1t. willgbe positioned withnespeot to-the face 22 that the handle actsavitationall'y to maintain thetsad face Wit in tlie contour of the slot19' of the in'15, and .to oause` the cam face 22 tobin upon the' pin 15within the contouriof the slot therein.. Thus, aslsoon as the handlev 23is swim over in the direotion erertieal, thehandle 4.23 will act, byats.own weight, to bind the of .the arrow A, past Pin. 15411 rasa-@imgIngram am shaft so.

seen that' the handle so has been swung in the directionof the arrow A,to. a point about midway between the positions indicated 1 b the solidand dotted "une positions of tile handle 23 in Fig. 1. The heads 8 and1'1 may readily be removed from their respective shafts, 5' and 6. whenit. is desired to remove the cork facings 121x) renew lthe same.'

In rac-tical operation the end of the shaft 5 which is'sp'ecilcallydenoted by the numerel 27 in Fig. 3, is inserted .into the chuck of alathe, rotatingthe' grinding head 8. The pin 15 may be slid int-hehead-4 to advance the grinding headll so that the cor-lr facings 12 maybear."I against the Watch glass which is to he ground, vthe pin 15 beingreadily located i'n'a fixed position by manipulating the handle 23. V I4 'While the4 grindin head 8V is being rotated as above descrioed, thearticle Iwhich is being polished, -rnay be held, between the grindingheads, and'against movement, by thelhand of the operator, o r :thearticle may be held in a suitable tool, or inl any other lf desired, theUshaped support.- ing member 1 may also besteadied by one hand of theoperator.

Having'thus described the invention what is` claimed isz-- y y 1. Adevice of the class described coni4 prisingl spaced arms; axially alinedshaft-s rotatably mounted in the arms transversely of the same, one ofthe'4 shaftsbeini slidably mou'nted; grinding heads upon t e ad '.acentends of the shafts ,means for adranc ,mg thesli-dably mounted shaft; anda deviceo eratinggravitationall tofbear against the a vancing means,toloc' the same.

2. A device ofthe class- 4described com-V prisin spacedsarrns; axiallyalined shafts f rotate ly mounted inthe arms transvereely4 of thesame,one of the shafts beingslidably f mounted; grindingheadsiupn Vtheadjacent. ends of the' shafts .af'pin slidably mounted in one of said"arms and ai'rangedfto bear4 4 Vagainst the 4slidablyjmvoxllnteui;shaft;anda' f oammounted in the last'named arm ,and

arranged to bear against the dpin. l )A Ydevice of the class escribedcorow prising a supporting member having spaced.

ing heads upon the adjacent 4ends 'o f shafts; a pin slidably mountedcuoio said 'arms' and arranged tofbearfa 'einst :the

i slidably mounted ,'shaft, Vthe pin v, 'avingfalon itudii'iallyslot'`#terminating versely mounted inthe-last named 'ai1nand'- `Wit inthecontour of thepinggfa-she-ft trai-isf ,the pin within the4 contourl o'f'th'e slot, ythe shaft'A being transversely v'groovc'fedV Yto .providefor the passagethe pin into-itel Support-H slidably I noulited insaidarm and arranged to bear4 againstl the shaft, thepin haring'a' flongitudinally 'disposed slot terminating 'within the contour ofthe pin;a shaft 'trans Yerselyniounted in said arm andhavmg'v a cani facearranged 'to bear against'thepin l within the contour of the' slijt,fthe shaft being transversely` groored to. proridefor' the passage ofthe pin into its supper-tin arm;

` .the a last named. shaft having-a -rs'a'ldial andle A operatinggravitationally to (maintain the ce rn `:v ithin-tl1e slot and inbearing upon the; pin :ya grindingfhead,upon-the first named.

shaft' and a coperatingrindin head :snpf ported fmf` roeden i a, amc-1jadaptedy to receive driving n lleans..V

A 4In testimony that. V1"., claim as :my own, I have vhereto adix'd'fniysigna-- ture intl-ie presence of -twowfv'i'tnessesf lEnWalenlarcnann-rmfrrses.; .Witesses 'W4' iC-F.RICJIS;..v

vLuminece Termen;

the foregoing;

eretefand

